Barber says he recalls Giffords shooting each Sat.

GREEN VALLEY, Ariz. (AP) — U.S. Rep. Ron Barber says the January 2011 mass shooting in Tucson that killed six and forced his predecessor, Gabrielle Giffords, to resign because of brain injuries, haunts him every Saturday.

Speaking Saturday at a Green Valley event to commemorate the shooting's two-year anniversary, Barber said that he has remembered the shooting every Saturday at the exact time it began.

Barber spoke at one of two events as part of a movement called BEYOND. It was started by the family of Gabe Zimmerman, who was one of six people killed in the Jan. 8, 2011, attack. Giffords was shot in the head and later resigned from Congress. Twelve others were injured, including Barber who was Giffords' district director.

Barber vowed in Zimmerman's honor to pursue legislation aimed at preventing mass shootings in the future.